Fix public triage launch flakiness

[Thaddeus Loke (thloke)]

Summary

• resolve Business Central application and platform manifest versions independently from the running container
• wait for the hosted Windows runner Docker API before creating the sandbox
• retry ALTool symbol downloads only when ALTool marks the failure as retryable
• pin BcContainerHelper 6.1.17 in both triage setup paths
• accept equivalent affirmative wording when the agent recommends closing an issue as likely fixed

Failure evidence

• Runs 30, 31, 33, and 34 requested platform 30 symbols from BC 30 artifacts whose platform was still 29, producing Downloaded 1 of 2 requested symbols
• Runs 20, 24, and 32 started before the hosted runner Docker API was ready
• Run 29 completed agent execution but failed the narrow likely-fixed recommendation regex

Validation

• pwsh -NoProfile -File scripts/Test-AlIssueTriageWorkflow.ps1
• PowerShell parser checks for all changed scripts
• git diff --check
• verified BcContainerHelper 6.1.17 is available from PSGallery and exports both version-discovery commands